JP5037011B2 - Optical sensor device - Google Patents

Description

  The present invention relates to an optical sensor in general, and more particularly to an optical sensor device including an optical sensor including a light emitting element and a light receiving element.

FIG. 7 is a perspective view showing a conventional example of an optical sensor. FIG. 8 is a perspective view showing the optical sensor of FIG. 7 attached to a mounting bracket. FIG. 9 is a perspective view showing a single mounting bracket of FIG.
The optical sensor 1 of FIG. 7 is attached to the mounting bracket 2 of FIG. 9 as shown in FIG. Elastic portions (not shown) provided in the optical sensor 1 are fitted into the hole portions 2 a and 2 b of the mounting bracket 2, and the optical sensor 1 is fixed to the mounting bracket 2.

FIG. 10 is a schematic cross-sectional view showing an operation state of a conventional optical sensor. The optical sensor 1 is fixed in the optical sensor device A by a mounting bracket 2. When the optical axis 1c portion of the optical sensor 1 is shielded by the light shielding plate 6 inserted from above, the signal of the optical sensor 1 changes.
The optical sensor 1 includes a light emitting element 1d and a light receiving element 1e. The exterior cover 5 covers the entire optical sensor 1 and the optical sensor device A. A part of the outer cover 5 has a hole 5 a for allowing the light shielding plate 6 to enter the inside toward the optical sensor 1.
FIG. 11 is a circuit diagram showing the inside of a conventional optical sensor. Since this circuit diagram is general, only the light emitting element portion 1d and the light receiving element portion 1e are shown, and the details are omitted.

However, in the above-described conventional optical sensor, when static electricity from the outside enters the optical sensor, it directly enters the light receiving element and the light emitting element, which causes a malfunction or destruction of the sensor.
That is, in the prior art, when a fingertip or the like charged with static electricity approaches the hole 5a, it is discharged to a place close to the nearest GND (ground). In the case of FIG. 10, according to an experiment, each element, that is, the terminal portion 1g connected to the substrate 1f of the light emitting element 1d and the light receiving element 1e becomes the nearest conductive portion, and thus discharges to this portion. The function is abnormal. If the sensor signal is erroneously output or, in the worst case, the sensor element is destroyed and it does not function.
Therefore, the object of the present invention is to short-circuit static electricity to the sensor element from the outside from the conductive member of the exterior and not directly to the sensor element, so that the sensor function abnormality due to static electricity, sensor signal error, An object of the present invention is to provide an optical sensor device that does not cause destruction of sensor elements.

In order to solve the above-mentioned problem, the invention according to claim 1 is an optical sensor device comprising an optical sensor including a light emitting element, a light receiving element, and a sensor substrate attached to a mounting bracket. A conductive member is provided on the sensor substrate between the light emitting element and the light receiving element from the sensor substrate toward the optical center of the light emitting element and the light receiving element .

  According to the present invention, all or part of the exterior member (case member) that covers the light emitting element, the light receiving element, and the sensor substrate is formed of the conductive member. Since it is discharged to the mounting bracket, the optical sensor element is not energized, so that the optical sensor can be prevented from being broken or malfunctioning.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic cross-sectional view showing a first embodiment of an optical sensor device according to the present invention. In FIG. 1, the optical sensor device A has an optical sensor 1 mounted in a hole provided in a mounting bracket 2 with a claw-like elastic portion 3a at the tip extending from the bottom of the case member 3.
A case (exterior) member 3 covering the light emitting element 4 and the light receiving element 5 of the optical sensor 1 is formed of a conductive resin material. The case member 3 is provided with an insertion hole 3b for inserting a light shielding plate (not shown).
Since the exterior member that covers the light emitting element 4, the light receiving element 5, the sensor substrate 7, and the mounting bracket 2 is formed of a conductive member, even if static electricity is discharged, it is discharged to the mounting bracket 2 through the case member 3. Therefore, the elements 4 and 5 of the optical sensor are not energized, and the optical sensor 1 can be prevented from being broken or malfunctioning.

FIG. 2 is a schematic cross-sectional view showing a second embodiment of the optical sensor device according to the present invention. In FIG. 2, the surface of the case member 3 that covers the light emitting element 4, the light receiving element 5, and the sensor substrate 7 of the optical sensor is coated with a conductive metal material 3c. In the figure, reference numeral 3a denotes an elastic portion, and 3b denotes an insertion hole for a light shielding plate (not shown).
The entire surface or part of the surface of the exterior member (case member) 3 of the optical sensor 1 is coated with a conductive metal, and static electricity is short-circuited from this portion (coating layer) 3c so that the light-emitting element 4 and the light-receiving element 5 are not directly short-circuited. I have to.
Thus, as in the case of the first embodiment, even if static electricity is discharged, it is discharged to the mounting bracket 2 through the coating portion 3c on the surface of the exterior member (case member) 3, and thus the optical sensor element. Since no current is supplied to the electrodes 4 and 5, the optical sensor can be prevented from being broken or malfunctioning.

FIG. 3 is a perspective view showing a metal member covering the optical sensor. 4 is a schematic view showing the metal member of FIG. 3 in a state where the optical sensor is covered. 3 and 4, the metal member 6 of FIG. 3 holds the mounting bracket 2 while covering the optical sensor 1 and is fixed to the mounting bracket 2 by the elastic portions 6a and 6b of the metal member 6 as shown in FIG. . In addition, the optical sensor alone can use a general optical sensor, and can take measures against static electricity at low cost.
Another conductive member 6 is attached along the exterior member (case member) 3 of the optical sensor 1, and static electricity is short-circuited by the conductive member 6 so as not to be directly short-circuited to the optical sensor element.
As a result, even if static electricity is discharged, the static electricity is discharged to the mounting bracket 2 through another conductive member 6, so that the optical sensor element is not energized, thereby preventing the optical sensor from being damaged or malfunctioning. it can.

  FIG. 5 is a schematic cross-sectional view showing a third embodiment of the optical sensor device according to the present invention. FIG. 6 is a circuit diagram of the optical sensor device according to the third embodiment. 5 and 6, metal members 8 and 9 are provided on the sensor substrate 7 of the optical sensor 1. Reference numeral 3 denotes a case member, and 3a denotes an elastic portion of the case member.

FIG. 6 shows the light emitting side 10 and the light receiving side 11 of the optical sensor 1, and the metal members 8 and 9 are separated from the GND 1 (ground) of the optical sensor 1 by a harness (not shown) on the control board (not shown). (Not shown).
Conductive members (metal members) 8 and 9 are placed between the light emitting element 4 and the light receiving element 5 on the sensor substrate 7 inside the optical sensor 1 from the sensor substrate 7 toward the optical center of the light emitting element 4 and the light receiving element 5. By providing, static electricity does not directly short to the optical sensor element. Thereby, even if the mounting bracket 2 or the like is a non-conductive member (resin material), it is possible to take measures against static electricity with the optical sensor alone.

1 is a schematic cross-sectional view showing a first embodiment of an optical sensor device according to the present invention. It is a schematic sectional drawing which shows 2nd Embodiment of the optical sensor apparatus by this invention. It is a perspective view which shows the metal member which covers an optical sensor. It is the schematic which shows the metal member of FIG. 3 of the state which covered the optical sensor. It is a schematic sectional drawing which shows 3rd Embodiment of the optical sensor apparatus by this invention. It is a circuit diagram of the optical sensor apparatus of 3rd Embodiment. It is a perspective view which shows the prior art example of an optical sensor. It is a perspective view shown in the state where the optical sensor of Drawing 7 was attached to the attachment bracket. It is a perspective view which shows the attachment bracket single-piece | unit of FIG. It is a schematic sectional drawing which shows the operation state of the optical sensor of a prior art. It is a circuit diagram which shows the inside of the optical sensor of a prior art.

Explanation of symbols

A Optical sensor device
1 Optical sensor
2 Mounting bracket 3 Case member (exterior member)
3a Elastic part 3c Coating 4 Light emitting element 5 Light receiving element 6 Metal member 6a Elastic part of metal member 6 6b Elastic part of metal member 6 7 Sensor substrate 8 Metal member 9 Metal member

Claims (1)

In an optical sensor device including an optical sensor including a light emitting element, a light receiving element, and a sensor substrate attached to a mounting bracket, between the light emitting element and the light receiving element on the sensor substrate inside the optical sensor. An optical sensor device , wherein a conductive member is provided from the sensor substrate toward the optical center of the light emitting element and the light receiving element .

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